Internal combustion engine



FIG. 1 is a front elevational view of an internal combustion engineshowing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front right perspective view thereof; and,

FIG. 8 is a rear right perspective view thereof.

The broken lines shown in FIGS. 1-8 are for purposes of illustratingportions of the internal combustion engine that form no part of theclaimed design.

The ornamental design for an internal combustion engine, as shown anddescribed.